Bootcamp 3.1 ram limitation on x64

Hi all, i'm using a 27" i7 iMac and running Windows 7 64bit via bootcamp 3.1
Now i've 4gb ram on my mac, but i want to upgrade it to 8 or 16gb..
I'm wondering is there any limitation on bootcamp ram limit? Is there any chance of Windows can't read 16GB ram?
Thank you..

Chart of features for various editions
http://www.winsupersite.com/win7/win7skuscompare.asp
I 'assume' you have Home Premium or above... so you would be fine (unless Apple's EFI is an issue) but it isn't a problem having up to 16GB.

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